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The coincidence of name between the Hindu Goddess Kali and the demon Kali is one of translation of the name and context of expression.

The Kalki Purana is the primary source for this mortal demon in which he is described as the source of all evil. In the Mahabharata, Kali is described as a gandharva. In the Mahabharat, he created the war between the Pandavas and the Kauravas in a game of Chaupar.

In the present days we may be said to live in Kali Yuga, which is said to have started in 3102 BCE with the end of the Mahabharata war. From the Mahabharata text:

Parikshit was a great ruler and looked very well after Hastinapur. But
unknown to the Pandavas and Parikshit, a greater threat loomed with
the death of Lord Krishna.

...

During the ninth day of the Mahabharatha war between the Pandavas and
the Kauravas, the third yuga had ended and last yuga - Kali yuga had
started. However because of the power of Lord Krishna, Kali could not
spread all through the earth....

The Kali (destructive) Yuga is the last era in the Hinduist cycle of time. It follows the Satya (golden, perfect), Treta (some negative), and Dwapara (50% negative) Yugas. It is named after Kali, the Hindu female deity of death and destruction.

It is a depiction of KaliYuga- an era of lies and corruption, which is presently going on.
It is written in different Vedas that there are four Yugas and their relation to the cow is given as:

Satya Yuga (or Krita Yuga) - it can be depicted as a cow standing on four legs

Treta Yuga - the cow is standing on three legs

Dwapara Yuga - the cow is standing on two legs

Kali Yuga - the cow is standing on one leg.

Here, no of legs is inversely proportional to the corruption level.
Also after every four Yugas, cosmic destruction occurs generally called as Pralaya, and a new cycle of life begins. It shows how destruction is necessary for new beginnings.
Last time this destruction happened, Manu was there to assemble a pair of each living being for the new cycle of life. Manu can be considered as Noah of Hinduism.

Hello and welcome to M&F SE. The question is about the origins of Kali, and you don't seem to try to answer it, seeing that you wrote only about the cows and the era.
– CalaomAug 9 at 7:41

@Calaom, You forgot to read the first half part of the question. Although I don't have the answer for the second part but does that forbids me from answering the first part?
– Neeraj BhattAug 9 at 10:27

This question?:Who is KALI and from where he came from? I don't see any answer to who he is or where does he come from? Or please tell me what question you are referring to? To me you seem to add a bit of lore around the question, but not answering it.
– CalaomAug 9 at 13:26

Or maybe it is just that I am not really understanding what Kali is either ^^'
– CalaomAug 9 at 13:36